Select a practical preliminary punch nose radius from sheet thickness, material and target inside bend radius.
| Radius / Thickness | Punch Radius | Relative Selection | Typical Reference | Status |
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Punch nose radius is commonly considered relative to sheet thickness when selecting press-brake tooling.
For general air-bending work, a punch nose radius near the desired inside radius is often a useful starting point, but the resulting bend radius is also controlled by the V-die opening and material properties.
The target inside radius is the primary geometry input for this selector. The recommended punch radius is selected to provide a practical starting point rather than an exact prediction of the formed radius.
For very small or very large target radii, the actual punch and die combination should be selected from the tooling manufacturer's charts.
In air bending, the V-die opening has a strong influence on the resulting inside radius. A wider opening generally produces a larger formed radius, while a narrower opening generally produces a smaller radius and higher forming force.
Therefore, the punch nose radius alone should not be used to predict the finished bend radius.
If an available punch radius is entered, the calculator compares it with the preliminary recommended radius.
A close match is marked as a preliminary match. Larger differences are flagged for tooling review because the resulting bend geometry may differ from the target.
What does the Press Brake Punch Radius Selector calculate?
It provides a preliminary punch nose radius reference using sheet thickness, material and target inside bend radius.
Is the punch nose radius the finished inside radius?
Not necessarily. Especially in air bending, the finished radius depends on the V-die opening, material properties, thickness and forming conditions.
Should the punch radius match the target inside radius?
It can be a useful starting point for tooling selection, but the actual formed radius must be verified using the selected punch, die and material.
Does a larger punch radius always produce a larger bend radius?
Punch geometry influences the bend, but the V-die opening and material properties are also important. The final radius cannot be determined from punch radius alone.
Can I check an existing punch?
Yes. Enter the available punch radius to compare it with the preliminary recommended radius.
Does this calculator guarantee the correct tooling?
No. It is a practical preliminary reference. Actual tooling selection should be verified against manufacturer data and the specific press-brake setup.